Here is just a quick listing of the book numbers so far. I don't have all of them and I would like to find pictures of the 25A, 25B along with the 26 and 27 supplements
#21 ; Model J
#23 ; Model J and K-3
#24, #24A, #24AA, #24B, #24C ; K and OK
#25, #25A, #25AA, #25B, #25C (Domestic and Export) ; 15-27 - 20-30
#26, #26M, #26C ; 20-30
#27, #27M, #27B ; 12-20

So I guess we would like to figure out the early parts list and what parts list #22 and before go to what tractor or equipment.